It's certainly not news that Silicon Valley and the San Francisco Bay Area are expensive places to live, with even modest tract residences listing for more than $1 million. But when it comes to true prestige listings, other locations make us seem like slackers.

But all of them pale in comparison to a home that was just listed for 350 million euros — approximately $410 million — and is now considered the most expensive home on the planet, according to a report in Bloomberg.

This 187-year-old, 18,000-square-foot, 14-bedroom mansion set on 35 acres in the south of France is owned by the Italian distiller Davide Campari-Milano SpA.

The price may be a shocker — even to Silicon Valley tech elite — but at least it doesn't have a $1 billion price tag. That was the speculation in the French press before the listing hit, which one official connected with the seller described as "absurd rumor and folly." Indeed.